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Only days after sporting the sci-fi Prada halterneck dress to co-host New York's Met Ball, Carey Mulligan has put the custom-made metallic number on eBay. Far from simply disposing of the slinky fish scale garment in a nonchalant, "When will I ever wear this again?" manner, Mulligan is donating all proceeds to Oxfam America.

Gushing that she was "really honoured to be wearing it", the glitzy gown was complimented by Mulligan's newlywed glow. Stepping out for her first public appearance since her marriage to musician Marcus Mumford, her only accessories were her wedding band and engagement ring.

A European size 38-40 and with a starting price of $500, the auction will close on Saturday, May 19 with a promise of delivery by June 11.